Window-lifter stop



J. D. LAWRENCE'AND W. G, FLEISCHAUER.

WINDOW LIFTER STOP.

APPLICATION FILED SEPT,16. 1918.

1,311,168. l Patented July 29, 1919,

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oHN D. LAWRENCE ANDWILLIAM G. FLEISCIIAUER, OF DETROIT, MICHIGAN, AssIGNORs To TEBNSTEDT MANUFACTURINp COMPANY, OF DETROIT, MICHI- 1 GAN, A CORPORATION OF MICHIGAN. Y

WINDOW-METER, STOP.

To all whom t may concern:

Beit known that we, JOHN D. LAWRENCE and WILLIAM G. FLEISCHUER, citizens of the United States, residing. at Detroit2 county of Wayne, State of Michigan, have invented a, new and useful Improvement in `Window Lifter Stops, of which the vfollowing is a specification.

This invention relates to a window lifter stop which automatically engages when the operator ceases to turn the Window lifting apparatus and automatically disengages when the Operator begins the turning Operation.

lVindow lifters are now quite extensively used in closed automobile bodies and window lifter stops have heretofore 'been manufactured. However, some were open to the objection that they involved too many parts from a mechanical standpoint, and some were noisy. In our improved Window lifter stop the stop is absolutely noiseless and `takes immediate effect upon release of power and is simple in its construction. This will `*more fully appear in the specification following.

In the drawings,-

Figure 'l is an elevation of the casing employed in the top of a window lift of an automob-ile, the casing being broken away to show the interior mechanism.

Fig. 2 is a top view of this casing with the window stop mechanism shown in section.

Fig. 3 vis a detail of the cam.

Fig. -is a fragmentaryelevation of the female clutch member. y

Fig. 5 is an elevation of vthe male clutch member.

Fig. 6 is a detail of the driving pinion.

Fig. 7 is a detail of the sha Y. Y'

a designates the housing for the gear wheels and stop of a windowlift now in common use on automobile bodies. b represents the window lifting chain, cvthe large driven gear, d the driving pinion, e the crank spindle which can be turned by a vcrank (not shown) placed upon the flattened end f.

The pinion d is not directly connected' for Specification Of Letters Patent. Patentgd July 29, 1919. Application led September 16, 1918. Serial No. 254,171.

socket is adapted to fit the male clutch part Z which can slide longitudinally of the crank spindle e. Both the cam z' and the male clutch part Z havesegmental slots m and n respectively to receive the 'driving pin o fast to the driving pinion (l. This driving pinion d is rotatably secured to the back of the housing by the lianged bushing p and nut g. The coiled spring r engaging the inside .face of the housing bears against the male clutch part and holds it in engagement vwith the female clutch part. The washer s reduces the friction on the parts in turning.

The opera-tion is as follows: The operator turns the crank spindle e upon which the cam z' is fast. T he cam t' fits in the recess m in the front of the male clutch part and is somewhat smaller than this recess. so that it has a certain'amount of freedom for' turning over the beveled side walls t. Obviously turning upon these bevels will force the male clutch part longitudinally backward upon the crank spindle and disengage the two clutch parts to allow freedom of movement for the window lifting mechanism. Immediately the power is released from the crank spindle. the spring forces the two clutch parts together and they engage easily and noiselessly to stop vthe window lifting meohanism and hold the windowin any desired osition. The cam and spindle will centralize themselves d ue to the bevel actingupon the cam through the efforts of the spring.

This construction is not only simpler than those heretofore made but it is noiseless and the stop takes immediate effect regardless of the position of the window as distinguished from the old stops which usually require the window to shift back slightly so as to bring two positive clutch parts into re 'stry.

' at we claim is: v

1. A Window lifter stop, comprising a pinion providedl with a, driving pin projecting laterally therefrom, a cam having a segcrank spindle fast to the cam, a pair of friction clutch parts, which engage by frictionvonly, and a Spring for normally holding them in engagement, the saids indle op- `erating to turn the Cam which inltially disengages the clutch parts and then picks up the driving pin to drive the driving pinion.

2. A Window lifter stop, comprisingy ay pinion rotatably supported, a cam having lost motion connections therewith, a spindle fast to the cam, a fein-ale cone clutch part, a male coneb clutch part, the latter provided with beveled portions upon which the cam rides, and a spring for keeping the two clutch partsl together, the turning of the spindle serving 'to throw the cam against the.

'beveled portions of the male clutch part to disengage the clutch parts before the cam comee` intoA direct driving relation with the pinion.

3. A window lifter sto comprising a housing, a pinion rotataby supported on one wall of the housing, a flanged sleeve for effecting such support, a spindle rotatably supported in this sleeve and the other wall of the housing, a cam fast to the spindle ing, a male friction clutch part on the spindle engaging with the female friction clutch part and having a cam surface by Whichit is shifted longitudinally on the spindle by the cam in taking up the play in the lost -motion connection with the pinion, and a spring for pressing the two clutch parts together.

In witness whereof we have hereunto set4 our hands on the 11th day of September, 

